Comparison of an Emulsion- and Solution-Prepared Acrylamide/AMPS Copolymer for a Fluid Loss Agent in Drilling Fluid
Comparison of an Emulsion- and Solution-Prepared Acrylamide/AMPS Copolymer for a Fluid Loss Agent in Drilling Fluid
复制标题
乳液和溶液制备的丙烯酰胺/AMPS 共聚物作为钻井液降滤失剂的比较
DOI：
10.1021/acsomega.0c00665
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发表时间：
2020-06-09
期刊：
影响因子：
4.1
通讯作者：
An, Yuxiu
中科院分区：
文献类型：
--
作者：
Ma, Jingyuan;Xia, Boru;An, Yuxiu
丙烯酰胺聚合物因其粘度范围广、功能多样而被广泛用作油田化学处理剂。但随着地层复杂程度的增加，其溶解性差、耐温、耐盐、耐钙能力低等缺点逐渐暴露出来。本文分别采用水溶液聚合法和反相乳液聚合法合成了丙烯酰胺(AM)/2-丙烯酰胺-2-甲基-1-丙磺酸(AMPS)共聚物。通过傅里叶变换红外（FTIR）光谱、核磁共振（H-1 NMR）、透射电子显微镜（TEM）、扫描电子显微镜（SEM）和粒度分析对水性聚合物（W-AM/AMPS）和反相乳液聚合物（E-AM/AMPS）进行表征。研究了其流变性能、过滤性能以及钠离子（Na+）和钙离子（Ca2+）的耐受性。结果表明，E-AM/AMPS不仅溶解速度比W-AM/AMPS快4倍，而且在老化前后均具有优异的剪切稀化性能。含有2wt％E-AM/AMPS的膨润土体系的过滤性能也优于含有2wt％W-AM/AMPS的膨润土体系。此外，E-AM/AMPS还表现出极高的Na+和Ca2+耐受性。 E-AM/AMPS和W-AM/AMPS在钻井液中的流变性和过滤性能的巨大差异可以归因于两种聚合方法引起的聚合物微观结构的差异。 FTIR和H-1 NMR结果表明，E-AM/AMPS分子基团和分子链之间形成了更多的氢键，导致E-AM/AMPS形成交联网络结构，TEM观察到。正是这种交联网络结构使得E-AM/AMPS具有较高的粘度，使其能够更好地吸附在膨润土颗粒上，从而表现出优异的流变和过滤行为。此外，E-AM/AMPS粉体具有较高的比表面积，可以更快地溶解在水中，大大减少了配置钻井液的时间和难度。
Acrylamide polymers were widely used as oilfield chemical treatment agents because of their wide viscosity range and versatile functions. However, with the increased formation complexity, their shortcomings such as poor solubility and low resistance to temperature, salt, and calcium were gradually exposed. In this paper, acrylamide (AM)/2-acrylamide-2-methyl-1-propane sulfonic acid (AMPS) copolymers were synthesized by aqueous solution polymerization and inverse emulsion polymerization, respectively. The aqueous polymer (W-AM/AMPS) and the inverse emulsion polymer (E-AM/AMPS) were characterized by Fourier transform infrared (FTIR) spectroscopy, nuclear magnetic resonance (H-1 NMR), transmission electron microscopy (TEM), scanning electron microscopy (SEM), and particle size analysis. The rheological properties, filtration properties, and sodium ion (Na+) and calcium ion (Ca2+) resistance were investigated. The results showed that E-AM/AMPS not only had a dissolution speed 4 times faster than that of W-AM/AMPS but also had superior shear-thinning performance both before and after aging. The filtration property of the bentonite system containing 2 wt % E-AM/AMPS was also better than that of the bentonite system containing 2 wt % W-AM/AMPS. In addition, E-AM/AMPS also exhibited extremely high tolerance for Na+ and Ca2+. The huge difference between rheological and filtration properties of E-AM/AMPS and W-AM/AMPS in drilling fluid can be attributed to the differences in the polymer microstructure caused by the two polymerization methods. Both FTIR and H-1 NMR results showed that more hydrogen bonds were formed between E-AM/AMPS molecular groups and molecular chains, which led to a cross-linked network structure of E-AM/AMPS which was observed by TEM. It was this cross-linked network structure that made E-AM/AMPS have a high viscosity and allowed it to be better adsorbed on bentonite particles, thus exhibiting excellent rheological and filtration behavior. In addition, E-AM/AMPS powder had a high specific surface area so that it can be dissolved in water faster, greatly reducing the time and difficulty of configuring drilling fluid.